Helen, who appeared as an actress in zombie movie 28 years later, said she decided she did not want to hide her hair loss by wearing wigs.

I just saw that film and didn't remember which role she had, so I checked IMDB, and it just says "infected women".

Turns out they gave her really shitty patchy strands of hair as part of that role: https://www.facebook.com/groups/379052361293089/posts/725981959933459/ That was accidentally kind of funny and unexpected.